Gas-engine.



W. I. TWOMBLY.

Patented July 1914.

WETN ESSES PATENT OFFICE.

WILLARD IRVING TWOM'BLY, OF'NEW YGBY,`N. Y.

GAS-ENGINE.

Specification of Leners raten.

Patented July '7, 1914.

Application filed July 2, 1912. Serial-No.. 707l52.

'To all whom it may concern:

iBe it known that. I, ILIARD '.IBVING TWOMBLY, a -citizenvof the Unitedzstates, 'residing'.in the borouglrof Manhattan, in ithe city, county, and 'State of New York, have'. invented. new. .and useful Improvements lin Gas-Engines, of which the -following is a specification.

L his vinvention .relates =to internal conibustionengines, and particularly to means to relieve the cylinder of the` high pressures of combustion previous to the exhaustiingv ofjhe burnt .gases therefrom.

Io relieve thel cylinder of the highgpres 15 lsures ofvcombustonzpreviousto the exhausting of the burnt gases, particularly in en- .gines .of the'fonr cycletype,I it has been cusltomaI-'y to provide the cylinder .Witlrafplufrailty of circumferentially disposed ports or I fopeningssadacentto the base othe-cylinader, which ports arenormally closed byl the '.fpiston, but-are uncovered by-the piston -as .itfreaches 'the end of its power or outward Stroke. Thisarrangement `works satisfac- '.torily aftera power vstrokehasbeen impart- -ed togthe piston and .the cylinder relieved. of afportion of the burnt gases. However, these .ports are=alsof uncovered at the end of the suction .stroke of the piston. Should a full charge of vfuel notventer the'cylinder air Would-rush into the cylinder through said ports at atmospheric pressure, and should thecharge be weak it would still further weakenthe charge with the liability 'that it :35, Wouldnot be ignited. Should a compressed chargeof fuelenter thel cylinder during the suction stroke of the piston, a portion of the charge would pass out through the ports andebe Wasted. Furthermore, the noise of 40 -the exhaustfrom said ports is very-objectionable.

It is the object of-.the presentinvention -to overcome they above disadvantagemthat is,; the preventing of any loss of the charge offuel to the cylinder during the; suction stroke fand the mailling of the exhaust from sailgports, and "forithis purpose I provi-de am ezqaansiblel 'membelg in the form of .a sectional fring, :to entend 5around' and :lia

ISOk contiguous tothe cylindery to normallyfzclse'- the .portalmeans 'being provided to rmit o'f. the :radial expansion'y and contraction of asaid imexnber,l and :to lprevent .s movement thereof; longitudinal won the r cylinder.

:1x11 the.' drawin .f accompanymg andi forinng eafzpartrsof l: t 's =spec1oatien,-}Figurel 1 is a sectional front elevation of a portion .of .azrolary Inultipleeylinder engineillus- -tnating an embodiment of my invention. Fig. 2 is a sectional detail View of the en pansible member or ring .to illustrate the .manner of expansibly connecting the ring sections. Fig. 23 is .asectional view of a pon tion of a cylinder showing the connection of the expansible' mernber'thereto; and Fig. 4 isa plan 'View of the expansible. member or ring.

Similar characters .of reference designate like vparts throughout the `di'i'erent views of the drawings.

Iny thet embodiment ofv myinvention illustrated in the drawing I have shown it in connectonwith a rotary multiple cylinder engine, .andhave-shown only so much of the engine as 1s essential toan understanding of the invention.

Cylinders -5 are fixed lto and project radially from Ya casing 6 rotatably mounted on a hollow crank sha t (not shown) pistons 7 having the usual piston ringsand oil grooves Working in saidfrcylin'ders and con nected to the crankshaft. The .charge of fuel 4tofthe cylindersiscontrelled by valves 8 in the pistons and theexhaust iscentrolled .by valves 9.in-,ports in theheads of the cylinders, all of which is snbstantiallyas shown. and described in'niy cci-pending apl pli-cation filed Sept. 19, .1911,"Serial No. 650,194, .and to lwhich referencemay .be had, although it `will beobviousthat my iinprovements may be applied-tonnel Work elcently in connection .with-,other-types of engines.

- The cylinder provided with a, lurality of icirenmferentaily disposcdaux` lary .eX- haust ports or openings ladjacent to the .base of the cylinderpvvhich ports are nor' mall covered bythe piston during the inwar or fuel compression and A.exhauststrokesof the piston, as shown'windotted lines in F ig. .1, and ;.a1'e iuncoveredby the 'piston atthenendof its outward or power and suction strokesas shown in :full, lines in Fig. 1.

' At the end of the power stroke ofthe pis- .tonuas theports 10 areuncovered,'tlieh1gh 'pressures ci" combustion rare exhausted through said ports, such exhaust making an objectionable noise, and fshould complete combustion not have 'taken lacel in the cyl i-ndera flamewill shoot rom-said ports.

The. portsare 'also luncovered .by thcpston at the end of the suction strokes and should a full charge 'not enter the cylinder and this` charge be weak, air at atmospheric pressure will enter through the ports 10 further Weakening the charge with the liability that it will not be ignited. Furthermore, should a. charge of fuel under compression enter the cylinder as the ports are uncovered a portion of the fuel would'pass out from the cylinder through said ports and be Wasted;A To overcome the above objections I vide an annular and radially expansibl'e member 11 'to extend around and li'e contiguous to the cylinder to normally cover the ports. This member is in the form of a ,band comprisinga pair of semi-circular sections7 each section having a laterally prou jectinql ear orlug12 at each end, and connected by guide 'screws 13 each passinnr through an opening in a lugrl 12 of one ban section and screw threaded linto the lug 12 of the other band section. Said ban-d Sections are normally maintained -in contracted position' by coil spr/ings 14 conned between the heads of the screws and the lugs 12 of one of the band sections, as clearly shown in Fig. 2. The expansible member ll Vis proguided and supported in an annular seat' formed in the wallsl of the cylinder'byA annularprojeeting ribs 15, 15. By this'construction it will be noted that tions can expand and contract only in one direction radially opposite to each other,

and owing to the connection of the band sections they will alwaysfbe their seat and prevented ment along the cylinder.

The operation of my improved device is substantially follows: Assuming the pist0n to be in the posi-tion shown in dotted lines in Fig. 1 and a charge of fuel compressed in the cylinder about to be ignited.

maintained in from having moveln this position the expansible member 11;

will be in its normal contracted position, the said member beingr so constructed as to leave a slight space between the cylinder walls and such. member as clearly shown at 16 Figs. 1 and 3 that is, the curvature of the" band .sections with relation to the cylinder is Such that they will contact with the cylinder adjacent the ends only so that there is a space between the cylinder and said band at diametrically opposite portions of the cylinder, the ports l0 communicatingr with said space and preferably extending only around a portion ofthe cylinder and'located at diametrically opposite .sections of the cylinder. tAs the charge is ignited anda power stroke imparted to the piston the piston will uncover the ports'atthc end of said stroke, as shown in i'ullv lilies in Fig. 1, a portion of the burnt gases in a compressed state passing through the ports into the space 16 in which they further c\pand7 such exnansion of the gnam forciruglr the band secthe band ,secsl tions apart until they assume the positie-*1+ shown in dotted lines `in Fie, i3. that is, stand away from the cylixulenwvitli auinlitlet. from the space 16 between the annular ribs 15 and band 11 permittingr the exhaust of such gases gradually to the atmosplufre .substantially at atmospheric pres-sure. lt will bo 'noted that as the band sections expand. such sections adjacent their ends will vat all times .engage in the seats between the flanges 15, thus preventing the band froml moving 'lon- I gitudinally of the cylinder. W'hen the ports" 10 are uncovered by the piston at the end of the suction stroke, the vaeuumcreated in the cylinder will tend to draw in Yand maintain the member 11 invit seat, thus preventing any of the charge from passing ont from said ports and the taking inet' any air at v Having thus described my invention, I

elalm:- .f f v I. 1. In an internal combustion engine, the. combination with a cylindema piston toworlc J in said cylinder andlmeanslto control Vthe charge of fuel to and `the exhaust' from the cylinder, of an auxiliary exhaust to relieve f the cylinder Aof the high pressures` of combastion previous -t0 theexhaust of the gases 95 therefrom, comprising a plurality olf :ports n in the cylinder normally covcredtby the piston and adapted to be uncovered atthe end of the outward strokes of the piston ;\fand an expansible member to normally'elose .said ,100 ports. f" y 2. ln' an internal coml'vustion` engine', the combination with a cylinder, .a lpiston :to work in said cylinder xrulments to; Control the chargev ofafuel toa'nd'rtheexhaustifrom `the Cylinder, of an aukilia'rf/v exhausttoarelieve thc-lfy cylinder of tlie yhighpressuresof combustihn previous to Ythe exhaust` of the gases therefrom, comprising a pluralityofy ports in the cylinder normally covered hy thepiston and adapted to be uncovered at 'the end ofthe outward strokes ofthe piston; i

and an expansiblelnuid exteiulingl around i f-; tlie cylinder and ni'irmally` closingr saidL Ports;

the cylinder adjacent to the :portsgfyax'id s rin to normallvxmaintain the sect'onsi oli .0 P Y A 5, ...is

giascs rtherethe lmml in position tu lie contguoim lo the ryliwlcl'.

if. [n un in* rnul wuixbustin'n engine, the vumliinuiiun with a cylinder, n piston lo wirk in snill, Cylinder am vulves to control liu lungi of furl to and the exhaust from the -.\'linl0r, of :i pluraliy nf auxiliary 0X- lmu t purl in i/llu cylinder nornmlly cuv wml liv tln pimun lull unrovcrswl l-y the pixtun ut, tlw rml of llnI mitwurd srokw; un unuulur ml, vxluulling uruuml tlm #ylinilvr :nljuwnt tln` pmb; :nul nu unuulur vxpnnsililv benul tu cngugre iu suill smit, so tlmt lwre ir: n spurl, lwlwiun tlm mill uf the Cyl inllvr und suirl lmml ut iliinnulricully uppositu pmtfxmis nl' llmwyliullor wil"l wliiili Llm purl mznmuuu'ulo, wherein; us lli@ pistun \\m-u\'l-.' flu: giuri# ul tlm vnfl uf tlm uutwunl :iimnx llu www will gruss llli'uuplx (liv pults vxpumliugj tin lmlul :unl permitting tlm 0S- my@ llaa-mil' tu lic atmosphere.

i'i. lu :nu inlvarml mnlnuliun rngino. tlic 'fvuilunnliiui vill u vylinilcr, n piston in work in snifl cylinder :md vulves to Control the charge of fuel tu and exhaust fromutne cylinder, of a plurality of auxiliary exhaust ports in the cylindvr normally covered by tlio piston but uncovered by the piston at the und of the outward strokes; a pair of urinulur ribs extending uruuml the cylinder tu l'mm un unnulur wut tlxorvbrtwern ulljuwut tu the ports; au cxpnnsilile bund engaging in Suid sgat, cumprising u [mir ot' srniiwirrulur smtmnx lmvlng lutvrully pro-v fil-cling' mrs :if llic owls; svi-@ws passing' lllruugll olmnings in tlm uur` (if um: if tlw liuuil Fwtiuns uml .www tlirvmlml infoitlie curs nl' tln ollwr lminl slrtiun; :unl springs vonliuml lwtwron the lwmls nl' suilx Truus uml llw, uurs wf u lmlnl srctiuu tn nurmully muinuin tlnI lmml in pmitimi to lil` contigumm to tlw uylinilm' nml ('llm; tllr portan lVlliiAlll) lliVlNG TWOMBLY. 

